SKU: BABL556033F Length: 12.3" Material: 4150 Chrome Moly Vanadium Profile: Hanson Finish: QPQ Corrosion Resistant Twist rate: 1:7 inches Gas system length: Carbine Gas block journal: 1.03" Gas Block Seat for .750" Low Profile Gas Blocks Only Muzzle: 1/2x28 Threaded Weight: 22oz Other information: HP and MPI Tested